Permanent Magnet MOC Latch for Seismic Switchgear
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Solution Overview
Problem
Mechanism Operated Cell (MOC) switches in switchgear assemblies face challenges in maintaining the open position under severe vibratory conditions, such as seismic events, due to insufficient holding force, leading to false operations and energy inefficiency in modern circuit breakers with reduced excess energy.
Innovation Solution
A magnetic linkage structure is introduced between the operating mechanism and the MOC operator structure, utilizing a permanent magnet to securely hold the MOC in the open position and disengage during closing, reducing the energy required for the MOC operation by minimizing the magnetic force as the circuit breaker closes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional return spring is added to hold the MOC in the open position, then the holding force in the open position is improved, but the energy consumption during closing operation increases substantially
Solution Approach 1:
The patent changes the physical state and properties of the holding mechanism from a mechanical spring system to a magnetic field system. The permanent magnet provides holding force through magnetic attraction to the armature, eliminating the need for a return spring. This parameter change allows the MOC to be held in the open position without continuous mechanical force, reducing energy consumption during closing operations while maintaining reliable holding capability.
Solution Approach 2:
The patent replaces the mechanical return spring system with a magnetic field-based holding mechanism. The permanent magnet structure creates a magnetic field that attracts the armature to hold the MOC in the open position. This substitution eliminates the mechanical spring force that would otherwise oppose the closing operation, thereby reducing energy consumption while maintaining the holding function.
2Use of energy by moving object
If the MOC is loosely held in position to reduce energy consumption, then the energy required for MOC operation is reduced, but false operation during seismic events occurs
Solution Approach 1:
The patent changes the holding mechanism from a loose mechanical connection to a magnetic field-based attraction system. The permanent magnet creates a magnetic field that provides sufficient holding force to prevent false operation during seismic events, while still allowing the MOC to be actuated when needed. This parameter change enables the system to maintain reliability without requiring excessive holding forces that would increase energy consumption.
Solution Approach 2:
The patent replaces the loose mechanical holding system with a magnetic field-based holding mechanism. The magnetic attraction between the permanent magnet and armature provides stable holding without the need for tight mechanical constraints or excessive spring forces. This substitution allows the MOC to remain securely held during seismic events while minimizing the energy required for operation.
3Reliability
If friction in the mechanism is increased to prevent false operation, then resistance to false operation during seismic events is improved, but the full and complete return of the MOC to the open position is prevented
Solution Approach 1:
The patent replaces the friction-based holding mechanism with a magnetic field-based holding system. The magnetic attraction provides holding force without creating the sliding friction that would impede the MOC's movement. This substitution allows the MOC to be held securely in the open position while still enabling complete and smooth return to the open position when actuated, without the resistance caused by friction.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the holding mechanism and the MOC. Instead of relying on direct mechanical contact and friction to hold the MOC in position, the magnetic field acts as a non-contact intermediary that provides holding force without creating mechanical friction. This allows the MOC to move freely when actuated while maintaining secure holding when stationary.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution ensures a robust holding force in the open position during seismic events and minimizes energy consumption by allowing the MOC to return to the open position with minimal energy expenditure, eliminating the need for additional return springs and optimizing energy use during the closing sequence.
Implementation Method 1
A magnetic linkage structure is introduced between the operating mechanism and the MOC operator structure, utilizing a permanent magnet to securely hold the MOC in the open position
Implementation Method 2
the armature being magnetically engaged with the permanent magnet structure to maintain the MOC operator structure in the open position
Implementation Method 3
minimizes energy consumption by allowing the MOC to return to the open position with minimal energy expenditure, eliminating the need for additional return springs
Data Source
AI summary
A MOC operator structure for a circuit breaker includes linkage structure coupled between the operating mechanism and an interface structure. An armature is associated with the linkage structure. Permanent magnet structure is associated with the circuit breaker and is disposed generally adjacent to the armature. Wherein, when the operating mechanism is coupled with the linkage structure and the operating mechanism moves in a first direction, a portion of the linkage structure moves in a first direction and moves the MOC operator structure to an open position, with the armature being magnetically engaged with permanent magnet structure to maintain the MOC operator structure in the open position. When the portion of the operating mechanism moves in a second direction, the portion of the linkage structure moves in a second direction and moves the MOC operator structure to a closed position, with the armature magnetically disengaging from the permanent magnet structure.